Question

In which condition red litmus paper turns blue?
A. Acidic
B. Basic
C. Neutral
D. None of these

Answer 1

By using litmus paper we can find the given solution is an acid or a base.
Litmus is a mixture which is soluble in water and it is extracted from different dyes of lichens. It is frequently adsorbed on the filter paper to prepare one of the oldest forms to find the pH of the different solutions.

Complete step by step answer:
- In the question it is asked under which conditions red litmus paper turns blue.
- Coming to given options, option A, acidic. Generally acidic conditions won’t change the red litmus paper to blue litmus paper. So, option A is not correct.
- Coming to option B, basic. Generally basic conditions change the red litmus paper to blue litmus paper.
So, option B is correct.
- Coming to option C, neutral. In neutral conditions red litmus paper won’t respond to any change in its color. So, option c is wrong.
- Therefore, red litmus paper turns blue in basic conditions.
So, the correct option is B.

Additional information: Certain general properties of bases are as follows:
1. Basic compounds are bitter to taste.
2. Basic compounds turn red litmus paper blue.
3. Basic compounds release hydroxyl ions in the aqueous solution.

Note: Litmus is used to test materials to find the acidity or alkalinity of the solution.
Acid converts blue litmus paper into red litmus paper and base converts red litmus paper into blue litmus paper.